NOTE 5. INVESTMENTS

Our investments are classified as either available-for-sale or held-to-maturity. The following table summarizes available-for-sale and held-to-maturity investments as of December 31, 2016 and March 31, 2016 (in thousands).

	Available-for-Sale Investments
December 31, 2016	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)			Fair Value
Corporate bonds	$	6,684	$	-	$	(20	)	$	6,664
Total available-for-sale investments	$	6,684	$	-	$	(20	)	$	6,664

	Held-to-Maturity Investments
December 31, 2016	Amortized Cost		Gross Unrecognized Gain		Gross Unrecognized (Loss)			Fair Value
Certificates of deposit	$	498	$	-	$	-		$	498
Commercial paper		8,580		1		(4	)		8,577
Corporate bonds		58,287		-		(229	)		58,058
Total held-to-maturity investments	$	67,365	$	1	$	(233	)	$	67,133

	Available-for-Sale Investments
March 31, 2016	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)			Fair Value
Corporate bonds	$	7,037	$	-	$	(12	)	$	7,025
Total available-for-sale investments	$	7,037	$	-	$	(12	)	$	7,025

	Held-to-Maturity Investments
March 31, 2016	Amortized Cost		Gross Unrecognized Gain		Gross Unrecognized (Loss)			Fair Value
Certificates of deposit	$	2,737	$	3	$	-		$	2,740
Commercial paper		12,455		-		(6	)		12,449
Corporate bonds		41,715		-		(117	)		41,598
Total held-to-maturity investments	$	56,907	$	3	$	(123	)	$	56,787

The amortized cost of our held-to-maturity investments approximates their fair value. As of December 31, 2016 and March 31, 2016, we did not have other-than-temporary impairment in the fair value of any individual security classified as held-to-maturity or available-for-sale. As of December 31, 2016 and March 31, 2016, we had unrealized loss on available-for-sale investments, net of related income taxes, of $11,000 and $7,000, respectively. During the three and nine months ended December 31, 2016 and 2015, we did not have any redemption of investments in accordance with callable provisions.

The following table summarizes the amortized cost and fair value of our investments, classified by stated maturity as of December 31, 2016 and March 31, 2016 (in thousands).

	December 31, 2016				December 31, 2016
	Available-for-Sale Investments				Held-to-Maturity Investments
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than one year	$	5,057	$	5,044	$	47,247	$	47,186
Due in 1 to 4 years		1,627		1,620		20,118		19,947
Total investments	$	6,684	$	6,664	$	67,365	$	67,133

	March 31, 2016				March 31, 2016
	Available-for-Sale Investments				Held-to-Maturity Investments
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than one year	$	4,314	$	4,311	$	37,163	$	37,128
Due in 1 to 4 years		2,723		2,714		19,744		19,659
Total investments	$	7,037	$	7,025	$	56,907	$	56,787